Automatic paralleling device.



No. 729,934. PATENTED JUNE 2, 1903.

B. M. HEMPHILL & E. BEIBER. AUTOMATIC PARALLELING DEVICE.

APPLICATION IILED DBO.24,1902.

HO MODEL.

' UNITED STATES Patented Juries, 1903.

PATENT OFFICE.

ELI M. HEMPHILL, OF AVALON, AND EDWARD BEIBER, OF PITTSBURG,

PENNSYLVANIA.

AUTOMATIC PARALLELING DEVICE.

SPECIFICATION forming part of Letters Patent N 0. 729,934, dated June 2,'1903.

. Application filed December 24, 1902. Serial No. 186,444. (No model.)

To all whom, it may concern:

Be it known that we, ELI M. HEMPHILL, residing at Avalon, and EDWARDBEIBER, residing at Pittsburg, in the county of Allegheny and State ofPennsylvania, citizens of the United States of America, have inventedcertain new and useful Improvements in Automatic Paralleling Devices, ofwhich the following is a specification, reference being had therein tothe accompanying drawings.

This invention relates to certain new and useful improvements inautomatic paralleling devices, and has for its object the provision ofmeans whereby two alternating-current generators adapted to run inparallel are automatically placed in parallel as soon as the generatorsare in step or synchronism. Heretofore and before our invention this hasgenerally been done by the use of two or more lamps connected betweenthe transformers and termed synchronizing-lamps. lVith such a system itis necessary that these lamps be watched by a man at the board untilthey go out entirely, and the operator then throws in the switch. Thusit requires the service of two men, one at the switch to observe thesynchronizing-lamps and one at the engine to vary the speed. By the aidof our invention it requires no operator or watcher at the board, as theswitch is automatically thrown in as soon as the generators are in stepor synchronism.

In describing the invention in detail reference is had to theaccompanying drawings, forming a part of this specification,and whereinlike numerals of reference indicate like parts throughout the severalviews,in which- Figure 1 is a diagrammatical view showing the circuitsto the transformers and switch. Fig. 2 is a plan view of the indicator,which is located at the engine (not shown) with the front plate or dialremoved. Fig. 3 is a horizontal sectional view of the same. Fig. 4t is afront elevation thereof. Fig. 5 is a detached detail perspective view ofthe switch and perating-magnet. Fig. 6 is a sectional view of a part ofthe indicating-mechanism magnet or solenoid, showing the mercury-cup andthe segment mechanism.

Our device embodies a solenoid located at the engine and in circuit witha small magnet located at the switchboard and also in circuit with thetransformers, and an indicatingpointer is mounted adjacent to thissolenoid and controlled thereby. We preferably arrange the mechanism atthe engine within a suitable casing, and though this is not essential wehave so shown and will describe the same. To this end we have shown thesolenoid 1 arranged in a circular casing 2, which latter may be mountedin any suitable manner at a desired'point on or near the engine. (Notshown.) To the inner face of the back plate of this casing is attached af rame-bar 3, connected to a front frame-bar 4 by arbors 5, 6, and 7,respectively. The arbor or shaft has mounted thereon a segment 8,provided with a threaded shank 9, on which is mounted aregulating-weight 10. A link 11 connects the segment 8 to the core orarmature 12 of solenoid 1. The'toothed segment 8 meshes with a pinionli, mounted on the arbor or shaft 6, which arbor or shaft carries acontact 15, adapted to make contact with a mercury-cup 16, whereby tocomplete the circuit and operate the switch when the generators are instep or synchronism. This mercurycup 16 is supported by and insulatedfrom the arbor or shaft 7, and the throw of the arbor or shaft 6 islimited by a stop 17, carried by the arbor or shaft 6. The arbor orshaft 6 extends through the front frame-bar 4E and has mounted on itsforward end an indicating-pointer 18, provided with an adjustable weight19. Circuit-wires 20 21 connect from binding-posts 22 23 on the casing 2through the synchronizing-lamps 24 with the trans formers 25, connectedto the machines to be synchronized, respectively, these bindingpostsbeing connected by wires 25 26 with binding-posts 27 28, to which thewindings ot' the solenoid 1 are connected.

On the switchboard 29 is mounted supporting-posts 30, in which ispivoted an armature 31, the upper end of which has acatch 32 to engagewith a plate 33,0arried by the switch 34, which is connected in the maincircuit leading from the generators. This switch is pivoted in a clip35, carried by the switch board 29, and when the catch end of thearmature is released from the plate 33 a spring 35 forces the switch upinto engagement with roe the clips 36, which is connected in the main.circuit, leading off the current from the generators. This spring wepreferably make in the form of a yoke, as shown, coiling the same nearits ends and inserting the ends through keepers. Located below thesupports 30 is a magnet 37 in circuit with the exciter or generatorthrough wires 38 39, connected to binding-posts 4O 41. Thesebinding-posts are con-.

nected, respectively, by wires 42 to the rear bar 3 of the frame and bywire 43 to a switch 44. The contact 15 is'thus electrically connected towire 42 through the frame.- The contact 45 of this switch is adapted toengage when the switch is closed with a contact 46, this contact46 beingconnected by wire 47 with the mercury-cup 16. The switch-handle 44carries the indicating-signs On and Off,

and the front plate of the casing is provided with an aperture 48, sothat said indicatingsigns may be observed to indicate or denote theposition of the switch. The upper part' or portion of the front plate ofthe casingis made of transparent material, and an indi-; eating-scale 49is preferably provided to indicate the amount of current.

In operation when the switch-handle 44 is off orin the position shown inFig. 1 the currentl indicating the advance of one genorator over theother flowing through the transformers 25 and the wires 20 21 willenergize the magnet 1 and. draw inward its core, which will in turncause the pointer 18 to rise, and the vibrations of this pointer will'indicate, approaching synchronism of the' generators driven by saidengines. As the pointer indicates the approaching synchronism theengineer throws switch-handle so as to move contact 45 in engagementwithcontact 46 and as the contact 15 engages in the mercury-cup 16 andcompletes the circuit through Wires 42 43 wires 38 39 to energize themagnet 37 and attract armature 31, thereby releasing switch 34 andallowing spring 35 to force said switch into engagement with its clip 36to close the satne, thereby throwing the current of the generators intothe same circuit.

In order to cushion the armature or core 12, we preferably provide aspring 50, carried on a disk 5, which latter is mounted on a screw 52 inthe lower end of solenoid 1.

To operate by hand, the operator will simply throw in the switch whenpointer 18 comes to rest.

Having fully described our invention, what we claim as new, and desireto secure by Letters Patent, is 7V 1. A device of the type set forthcomprising in combination with transformers adapted to be connected withgenerators to be synchronized, synchronizing-lamps connected to thetransformers, a solenoid electrically connected with said lamps, meanssecured to the core of said solenoid for establishing a circuit toactuate a main switch upon the synchronizing of the generators,indicating means connected therewith, and a main switch adapted to closethe circuit between the generators, substantially as described. i

2. A device of the character described, comprising a main switch, acircuit for leading off the current of two synchronized generatorscontrolled thereby, an electrically actuated means for actuatingsaidswitch, a circuit leading from said means, a switch for :said lastnamedcircuit, means forcompleting said circuit on the synchronizing of thegenerators comprising a mercury-cnp connected in said circuit, a pivotedcontact-piece therefor carrying a pinion, a pivoted arm carrying asegment meshing with said pinion, a solenoi d, a core therefor securedto said pivoted arm, adapted to actuate the saute, synchronizinglatnpselectrically connected with the solenoid, and with transformers, saidtransformers being connected with the generators, and means actuated bythe solenoid-core for indicating approaching synchronizing of thegenerators, substantially as described.

A device of the type set forth comprising in circuit with transformers,synchronizinglamps, a solenoid connected therewith, means actuated bythe core thereof to complete a second circuit, means for indicatingsynchronism actuated thereby, a switch for the second circuit, a mainswitch adapted to be actuated upon the closing of said last-namedcircuit, and a circuit adapted to conduct off the current from thesynchronized generators, upon the closing of the said main switch,substantially as described.

In testimory whereof we aflix our signatures in the presence of twowitnesses.

ELI M. I-IEMPHILL. EDWARD BEIBER.

W'itnesses:

A. M. WILSON, E. E. POTTER.

ICO

